Final published version
Research output: Contribution in Book/Report/Proceedings - With ISBN/ISSN › Conference contribution/Paper › peer-review
Publication date | 2010 |
---|---|
Host publication | Proceedings of the 3rd European Workshop on System Security, EUROSEC'10 |
Place of Publication | New York |
Publisher | ACM |
Pages | 36-41 |
Number of pages | 6 |
ISBN (print) | 9781450300599 |
<mark>Original language</mark> | English |
Event | 3rd European Workshop on System Security, EUROSEC'10 - Paris, France Duration: 13/04/2010 → 13/04/2010 |
Conference | 3rd European Workshop on System Security, EUROSEC'10 |
---|---|
Country/Territory | France |
City | Paris |
Period | 13/04/10 → 13/04/10 |
Conference | 3rd European Workshop on System Security, EUROSEC'10 |
---|---|
Country/Territory | France |
City | Paris |
Period | 13/04/10 → 13/04/10 |
CAPTCHA is a standard security technology that presents tests to tell computers and humans apart. In this paper, we examine the security of a new CAPTCHA that was deployed until very recently by Megaupload, a leading online storage and delivery website. The security of this scheme relies on a novel segmentation resistance mechanism. However, we show that this CAPTCHA can be segmented using a simple but new automated attack with a success rate of 78%. It takes about 120 ms on average to segment each challenge on a standard desktop computer.